[Diy_efi] Confused! Lost!

[bcroe at juno.com]

It looks like peak and hold to me; 13 ohms doesn't rule 
that out.  Or maybe they are just operating a saturated inj
with peak and hold circuitry; kind of loses the simplified 
driver advantage.  

Bruce Roe

26 Feb 2003 Adam Wade <espresso_doppio at yahoo.com> writes:

> Kawasaki ZX-12R motorcycle.  Approx. 13 ohm injectors,
> so it's a sat driver, right?
> 
> Welllll...  The idle trace from any of the injectors
> shows what very much appears to be a P&H trace...  A
> drop, then TWO spikes in close succession.  Like this:
> 
> http://www.easttraining.com/images/Waveforms/gm_tbiv_p&h01.jpg
> 
> This is somewhat irregular...  About 80% of the idle
> events looks like p&h, the remainder look like regular
> sat events, thusly:
> 
> http://www.easttraining.com/images/Waveforms/efi_conv.jpg
> 
> As the revs come up, the injector events pretty much
> all appear to be sat-type.
> 
> WHAT ON EARTH gives?!  I was very much under the
> impression that driving a high-impedance injector with
> a P&H driver would result in the injector acting as if
> it was being driven by a sat driver.

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